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## Homework Statement

y''+16y=3.36

This is actually part of a spring question I'm attempting at the moment, and I'm having a mental blank on how to deal with the 3.36.

## Homework Equations

n/a

## The Attempt at a Solution

I've found the characteristic equation and solution based from that;

[tex] c_1 cos(4x) + c_2 sin(4x) [/tex]

but the answer is

[tex] c_1 cos(4x) + c_2 sin(4x) + 0.21 [/tex]

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